You need to get a key to unlock the chest. The key dropped off a mob in a room if you take the hallway to the left as you enter the zone. Around ( 131, -6, -86 ) /waypoint 130.99, -6.16, -85.69 The key everyone gets.

If your inventory is full, this step will not update.

If you are not on this step, you will not update. Go to the basement before seeking the key and chest.